The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 05, 2000
Filed:
Mar. 11, 1994
David C Waugh, Oklahoma City, OK (US);
Randall D Hampshire, Edmond, OK (US);
Seagate Technology, Inc., Scotts Valley, CA (US);
Abstract
A method for adapting acceleration and deceleration of a disc drive transducer during movements between initial and target tracks on a disc surface to the maximum current available to drive an actuator whereon the transducer is mounted. During acceleration of the transducer, while the actuator current is substantially a maximum, the current supplied to the actuator coil is measured and a scale factor is determined as the square root of the ratio of the maximum current supplied to the actuator and a nominal current from which a velocity profile, used to effect velocity control of the movement, has been predetermined. Thereafter, the current supplied to the actuator is adjusted in a succession of time intervals by measuring the velocity of the transducer, determining a profile velocity in each interval from the velocity profile, generating a demand velocity by scaling the profile velocity by the scale factor, generating a correction signal from the difference of the measured and demand velocities, and supplying current to the actuator in proportion to the correction signal.